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joewell80 · 11-13-2015, 12:43 PM

I installed a new GM performance HEI (proform) on my 350 with Edelbrock carb and Holley aluminum intake. I'm using CR43ts plugs gaped to .045, initial timing set to 14* at 700 rpm's and at 3000rpm's mechanical advance jumps it to 36*. When I hook up the vacuum (ported) it jumps to 48* at 3000 rpm's. It seems to run ok but I'm wondering if the vacuum is advancing total timing to much?

11-13-2015, 12:43 PM	#37
joewell80 Registered User Join Date: Oct 2014 Location: Manitowoc, WI Posts: 52	Re: 350 timing with HEI I installed a new GM performance HEI (proform) on my 350 with Edelbrock carb and Holley aluminum intake. I'm using CR43ts plugs gaped to .045, initial timing set to 14* at 700 rpm's and at 3000rpm's mechanical advance jumps it to 36. When I hook up the vacuum (ported) it jumps to 48 at 3000 rpm's. It seems to run ok but I'm wondering if the vacuum is advancing total timing to much?